.\" $OpenBSD: EVP_aes_128_cbc.3,v 1.4 2020/06/24 18:15:00 jmc Exp $
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.\" This file was written by Ronald Tse <ronald.tse@ribose.com>
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.Dd $Mdocdate: June 24 2020 $
.Dt EVP_AES_128_CBC 3
.Os
.Sh NAME
.Nm EVP_aes_128_cbc ,
.Nm EVP_aes_192_cbc ,
.Nm EVP_aes_256_cbc ,
.Nm EVP_aes_128_cfb1 ,
.Nm EVP_aes_192_cfb1 ,
.Nm EVP_aes_256_cfb1 ,
.Nm EVP_aes_128_cfb8 ,
.Nm EVP_aes_192_cfb8 ,
.Nm EVP_aes_256_cfb8 ,
.Nm EVP_aes_128_cfb128 ,
.Nm EVP_aes_192_cfb128 ,
.Nm EVP_aes_256_cfb128 ,
.Nm EVP_aes_128_cfb ,
.Nm EVP_aes_192_cfb ,
.Nm EVP_aes_256_cfb ,
.Nm EVP_aes_128_ctr ,
.Nm EVP_aes_192_ctr ,
.Nm EVP_aes_256_ctr ,
.Nm EVP_aes_128_ecb ,
.Nm EVP_aes_192_ecb ,
.Nm EVP_aes_256_ecb ,
.Nm EVP_aes_128_ofb ,
.Nm EVP_aes_192_ofb ,
.Nm EVP_aes_256_ofb ,
.Nm EVP_aes_128_cbc_hmac_sha1 ,
.Nm EVP_aes_256_cbc_hmac_sha1 ,
.Nm EVP_aes_128_ccm ,
.Nm EVP_aes_192_ccm ,
.Nm EVP_aes_256_ccm ,
.Nm EVP_aes_128_gcm ,
.Nm EVP_aes_192_gcm ,
.Nm EVP_aes_256_gcm ,
.Nm EVP_aes_128_wrap ,
.Nm EVP_aes_192_wrap ,
.Nm EVP_aes_256_wrap ,
.Nm EVP_aes_128_xts ,
.Nm EVP_aes_256_xts
.Nd EVP AES cipher
.Sh SYNOPSIS
.In openssl/evp.h
.Ft const EVP_CIPHER *
.Fn EVP_aes_128_cbc void
.Ft const EVP_CIPHER *
.Fn EVP_aes_192_cbc void
.Ft const EVP_CIPHER *
.Fn EVP_aes_256_cbc void
.Ft const EVP_CIPHER *
.Fn EVP_aes_128_cfb1 void
.Ft const EVP_CIPHER *
.Fn EVP_aes_192_cfb1 void
.Ft const EVP_CIPHER *
.Fn EVP_aes_256_cfb1 void
.Ft const EVP_CIPHER *
.Fn EVP_aes_128_cfb8 void
.Ft const EVP_CIPHER *
.Fn EVP_aes_192_cfb8 void
.Ft const EVP_CIPHER *
.Fn EVP_aes_256_cfb8 void
.Ft const EVP_CIPHER *
.Fn EVP_aes_128_cfb128 void
.Ft const EVP_CIPHER *
.Fn EVP_aes_192_cfb128 void
.Ft const EVP_CIPHER *
.Fn EVP_aes_256_cfb128 void
.Ft const EVP_CIPHER *
.Fn EVP_aes_128_cfb void
.Ft const EVP_CIPHER *
.Fn EVP_aes_192_cfb void
.Ft const EVP_CIPHER *
.Fn EVP_aes_256_cfb void
.Ft const EVP_CIPHER *
.Fn EVP_aes_128_ctr void
.Ft const EVP_CIPHER *
.Fn EVP_aes_192_ctr void
.Ft const EVP_CIPHER *
.Fn EVP_aes_256_ctr void
.Ft const EVP_CIPHER *
.Fn EVP_aes_128_ecb void
.Ft const EVP_CIPHER *
.Fn EVP_aes_192_ecb void
.Ft const EVP_CIPHER *
.Fn EVP_aes_256_ecb void
.Ft const EVP_CIPHER *
.Fn EVP_aes_128_ofb void
.Ft const EVP_CIPHER *
.Fn EVP_aes_192_ofb void
.Ft const EVP_CIPHER *
.Fn EVP_aes_256_ofb void
.Ft const EVP_CIPHER *
.Fn EVP_aes_128_cbc_hmac_sha1 void
.Ft const EVP_CIPHER *
.Fn EVP_aes_256_cbc_hmac_sha1 void
.Ft const EVP_CIPHER *
.Fn EVP_aes_128_ccm void
.Ft const EVP_CIPHER *
.Fn EVP_aes_192_ccm void
.Ft const EVP_CIPHER *
.Fn EVP_aes_256_ccm void
.Ft const EVP_CIPHER *
.Fn EVP_aes_128_gcm void
.Ft const EVP_CIPHER *
.Fn EVP_aes_192_gcm void
.Ft const EVP_CIPHER *
.Fn EVP_aes_256_gcm void
.Ft const EVP_CIPHER *
.Fn EVP_aes_128_wrap void
.Ft const EVP_CIPHER *
.Fn EVP_aes_192_wrap void
.Ft const EVP_CIPHER *
.Fn EVP_aes_256_wrap void
.Ft const EVP_CIPHER *
.Fn EVP_aes_128_xts void
.Ft const EVP_CIPHER *
.Fn EVP_aes_256_xts void
.Sh DESCRIPTION
These functions provide the AES encryption algorithm in the
.Xr evp 3
framework.
.Pp
.Fn EVP_aes_128_cbc ,
.Fn EVP_aes_192_cbc ,
.Fn EVP_aes_256_cbc ,
.Fn EVP_aes_128_cfb1 ,
.Fn EVP_aes_192_cfb1 ,
.Fn EVP_aes_256_cfb1 ,
.Fn EVP_aes_128_cfb8 ,
.Fn EVP_aes_192_cfb8 ,
.Fn EVP_aes_256_cfb8 ,
.Fn EVP_aes_128_cfb128 ,
.Fn EVP_aes_192_cfb128 ,
.Fn EVP_aes_256_cfb128 ,
.Fn EVP_aes_128_ctr ,
.Fn EVP_aes_192_ctr ,
.Fn EVP_aes_256_ctr ,
.Fn EVP_aes_128_ecb ,
.Fn EVP_aes_192_ecb ,
.Fn EVP_aes_256_ecb ,
.Fn EVP_aes_128_ofb ,
.Fn EVP_aes_192_ofb ,
and
.Fn EVP_aes_256_ofb
provide AES for 128, 192, and 256-bit keys in the following modes:
CBC, CFB with 1-bit shift, CFB with 8-bit shift, CFB with 128-bit shift,
CTR, ECB, and OFB.
.Pp
.Fn EVP_aes_128_cfb ,
.Fn EVP_aes_192_cfb ,
and
.Fn EVP_aes_256_cfb
are aliases for
.Fn EVP_aes_128_cfb128 ,
.Fn EVP_aes_192_cfb128 ,
and
.Fn EVP_aes_256_cfb128 .
.Pp
.Fn EVP_aes_128_cbc_hmac_sha1
and
.Fn EVP_aes_256_cbc_hmac_sha1
provide authenticated encryption with AES in CBC mode using SHA-1 as HMAC,
with keys of 128 and 256-bit length respectively.
The authentication tag is 160 bits long.
This is not intended for usage outside of TLS and requires
calling of some undocumented control functions.
These ciphers do not conform to the EVP AEAD interface.
.Pp
.Fn EVP_aes_128_ccm ,
.Fn EVP_aes_192_ccm ,
.Fn EVP_aes_256_ccm ,
.Fn EVP_aes_128_gcm ,
.Fn EVP_aes_192_gcm ,
and
.Fn EVP_aes_256_gcm
provide AES for 128, 192 and 256-bit keys in CBC-MAC Mode (CCM)
and Galois Counter Mode (GCM), respectively.
These ciphers require additional control operations to function
correctly; see
.Xr EVP_EncryptInit 3
for details.
.Pp
.Fn EVP_aes_128_wrap ,
.Fn EVP_aes_192_wrap ,
and
.Fn EVP_aes_256_wrap
provide AES key wrap with 128, 192 and 256-bit keys
according to RFC 3394 section 2.2.1 ("wrap").
When the returned
.Vt EVP_CIPHER
object is later passed to
.Xr EVP_CipherInit_ex 3 ,
.Xr EVP_EncryptInit_ex 3 ,
or
.Xr EVP_DecryptInit_ex 3
together with an
.Vt EVP_CIPHER_CTX
object, the flag
.Dv EVP_CIPHER_CTX_FLAG_WRAP_ALLOW
must have been set in the
.Vt EVP_CIPHER_CTX
using
.Xr EVP_CIPHER_CTX_set_flags 3 .
Otherwise, or when passing the returned
.Vt EVP_CIPHER
object to
.Xr EVP_CipherInit 3 ,
.Xr EVP_EncryptInit 3 ,
or
.Xr EVP_DecryptInit 3 ,
initialization fails with a
.Dq wrap not allowed
error.
.Pp
.Fn EVP_aes_128_xts
and
.Fn EVP_aes_256_xts
provide XEX-based tweaked-codebook mode with ciphertext stealing (XTS-AES)
as specified in IEEE Std. 1619-2007 and described in NIST SP 800-38E.
It was designed for encrypting data on a storage device,
provides confidentiality but not authentication of data,
and requires a key of double length for protection of a certain key size.
In particular, XTS-AES-128 takes input of a 256-bit key to achieve
AES 128-bit security, and XTS-AES-256 takes input of a 512-bit key
to achieve AES 256-bit security.
.Sh RETURN VALUES
These functions return an
.Vt EVP_CIPHER
structure that provides the implementation of the symmetric cipher.
.Sh SEE ALSO
.Xr AES_encrypt 3 ,
.Xr evp 3 ,
.Xr EVP_EncryptInit 3
.Sh HISTORY
.Fn EVP_aes_128_cbc ,
.Fn EVP_aes_192_cbc ,
.Fn EVP_aes_256_cbc ,
.Fn EVP_aes_128_cfb ,
.Fn EVP_aes_192_cfb ,
.Fn EVP_aes_256_cfb ,
.Fn EVP_aes_128_ebc ,
.Fn EVP_aes_192_ebc ,
.Fn EVP_aes_256_ebc ,
.Fn EVP_aes_128_ofb ,
.Fn EVP_aes_192_ofb ,
and
.Fn EVP_aes_256_ofb
first appeared in OpenSSL 0.9.7 and have been available since
.Ox 3.2 .
.Pp
.Fn EVP_aes_128_cfb1 ,
.Fn EVP_aes_192_cfb1 ,
.Fn EVP_aes_256_cfb1 ,
.Fn EVP_aes_128_cfb8 ,
.Fn EVP_aes_192_cfb8 ,
.Fn EVP_aes_256_cfb8 ,
.Fn EVP_aes_128_cfb128 ,
.Fn EVP_aes_192_cfb128 ,
and
.Fn EVP_aes_256_cfb128
first appeared in OpenSSL 0.9.7e and have been available since
.Ox 3.8 .
.Pp
.Fn EVP_aes_128_ctr ,
.Fn EVP_aes_192_ctr ,
.Fn EVP_aes_256_ctr ,
.Fn EVP_aes_128_cbc_hmac_sha1 ,
.Fn EVP_aes_256_cbc_hmac_sha1 ,
.Fn EVP_aes_128_ccm ,
.Fn EVP_aes_192_ccm ,
.Fn EVP_aes_256_ccm ,
.Fn EVP_aes_128_gcm ,
.Fn EVP_aes_192_gcm ,
.Fn EVP_aes_256_gcm ,
.Fn EVP_aes_128_xts ,
and
.Fn EVP_aes_256_xts
first appeared in OpenSSL 1.0.1 and have been available since
.Ox 5.3 .
.Pp
.Fn EVP_aes_128_wrap ,
.Fn EVP_aes_192_wrap ,
and
.Fn EVP_aes_256_wrap
first appeared in OpenSSL 1.0.2 and have been available since
.Ox 6.5 .
